Improvement in tap-wrenches



J. F. bUNIGAN.

- TAP-WRENCH.

No. 177,820. Patented my 23,1876..

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UNITED STATES PATENT (DEEICEc UAMESE. DUNIGAN, CE DEEREIELu-ASSIGNOR To WILEY a RUSSELL MANUFACTURING COMPANY, 0E GEEENEIELD, MASSACHUSETTS.

IMPROVEMENT IN TAP-WRENCH ES.

Specification forming part of Letters Patent No. 177.820, dated May 23, 1876; application filed February 8, 1876.

To all whom it may concern:

Be it known that I, JAMES F. rDUNIGAN, of Deerfield, county of Franklin, and State of Massachusetts, haveinvented certain Improvements in ATap-VVrenches.

The following description, taken in connection with the accom panying plate of drawin gs, hereinafter referred to, forms a full and exact specification, wherein are set forth the nature and principles of the invention,` by which the same may be' distinguisl1ed from others of a similar class, together with such part-s thereof as are claimed as new and are desired to be secured by Letters Patent of the United States.

My invention relates lto that class of tapwrenches having adjustable jaws; and the nature thereof consists iu the novel combination ofthe parts composing the same, as hereinafter described and shown.

Inl the accompanying plate of' drawings, in which corresponding parts are designated by similar letters, Figure l illustrates the eX- terior of the wrench. Fig. 2 is a view with .oneof exterior plates removed. Fig. 3 represents the tubular screw, which actuates the jaw, detached from the implement. Fig. is

.a View of one of the handles detached from the implement. Fig. 5 is a horizontal transverse section on line a: w of Fig. 2.

A designates the stoclgupon each end of through the said jaws and through slots cut in the said handles.

When the jaws are made to recede from each other, in order to adapt them to a large tap by rotating the collars, the handles also l reach from each other, and the power of the implement is increased. v

I claim and desire to secure by Letters Patentof the United States- The combination` of the stock, the collars, the jaws, and the handles attached to said jaw, as and for the purposes described.

In testimony that I claim the foregoing I have hereunto set my hand and seal this 14th day of J anna-ry, 1876.

JAMES F. DUNIGAN. Witnesses:

GEC. TURNER, PHILIPP SEIBERT. 

